Redmond Physical Therapy PCL

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Redmond Physical Therapy
Symptoms & Pathologies

Where is the PCL?

The word "cruciate" loosely defined, means "crossed", referring to the fact that there are two cruciate PCL ligaments, the ACL (a broad ligament) crosses from front to back and the PCL (Posterior Cruciate Ligament) crossing fromthe back to the front. The PCL is the stronger of the two ligaments it arises from the posterior (back) of the intercondylar area of the tibia (shin bone) and passes above and anteriorly on the medial side of the ACL.

What does the PCL do?

The PCL prevents anterior displacement of the femur (thigh bone) over the tibia (shin bone) and backwards movement of the tibia (shin bone). The ligament also helps to prevent hyperflexion of the knee (ie the knee getting bent up under or behind you).

Causes of PCL Injury?

The most common mechanism of injury of the PCL is the so-called "dashboard injury." When the knee is bent, and an object forcefully hits the tibia (shin bone) backwards, this can push the tibia poteriorly (backwards), and cause a PCL tear. The other mechanism of injury is hyperflexion of the knee, with the foot held pointing downwards. This type of stress in the knee can stretch the PCL beyond its normal elastic range for it's fibers and subsequently tear. Once the ligament tears, it doesn't heal — it remains loose.

What are the symptoms of an PCL tear?

The most common symptoms of a PCL tear are quite similar to the symptoms of an ACL tear. Knee pain, swelling, and decreased motion are common with both injuries. Patients may have a sensation that their knee "popped" or gave out. Problems with instability in the weeks and months following PCL injury are not as common as instability following an ACL tear. When patients have instability after a PCL injury they usually state that they can't "trust" their knee, or that it feels as though the knee may give away. If this complaint of instability is a problem after a PCL injury, it is a strong indicator that a trip to your family physician or orthopedic surgeon will be necessary.

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